Wow, everyone! This all sounds so very technical. There is a surgeon's office that I go to occasionally and there are quilts hanging everywhere! Wonderful quilts! And, they are protected by...............nothing! I always admire them, but had never thought about the lighting or touching of them. But, they all seem to do just fine. Maybe the owner(s) periodically swap them out, and possibly wash them if necessary. And, I'm remembering one that hangs high in the mamo lab, which again, is unprotected by anything. Of course, that one cannot be touched, unless you are 10 feet tall.